Roll ramming apparatus.



H. P. MAGDONALD & H. G. PARKER.

ROLL RAMMING APPARATUS.

APPLICATION FILED NOV. 26, 1913.

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H. P. MACDONALD & H. G. PARKER. ROLL RAMMING APPARATUS.

APPLIGATION FILED NOV. 26, 1913.

COLUMBIA PLANOCIRAPH CO.,WASHINUTON, n. c.

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ROLL RAMMING APPARATUS. APPLICATION FILED NOV. 26, 1913.

Patented Apr. 21, 191 L 3 SHEETS-SHEET 3.

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1 no sTAgEs grENT OFFICE.

HARRY P. MACDONALD, OF MONTCLAIR, AND HENRY C. PARKER, OF ELIZABETH, NEW JERSEY, ASSIGNOB-S TO THE SNEAD & CO. IRON VIORKS, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

ROLL RAMMING APPARATUS.

inseam.

have invented certain new and useful Tm provements in Roll Hamming Apparatus, of which the following is a specification.

This invention relates to sand molding apparatus and more particularly to that type of apparatus wherein the sand is compressed by a roll which is passed back and forth over the flask.

Among the primary objects of the invention are the provision of an improved mechanism for actuating the roll of a simple and compact construction; the provision of an improved self-contained driving mechanism for the roll which is movable along with the roll and which requires minimum head room; and the provision of an improved supportin means for the roll.

Other objects of the invention reside in the provision of an improved arrangement of strike-off means, and in the provision of means which serve at the same time as a support for the roll and as a means for moving it.

The foregoing together with such other objects as may hereinafter appear or are incident to our invention. lVe attain by means of a construction illustrated in preferred form in the accompanying drawings, wherein Figure 1 is a plan view of our improved apparatus; Fig. 2 is a side elevation of the device shown in Fig. 1; Fig. 2 is an end View of one of the roll supporting tracks and shows the means for supporting the end thereof; Fig. 3 is an end elevation of Fig. 1; Fig. t is an end elevation of a detail feature of construction of the roll supporting mechanism; Fig. 5 is a sectional View illustrating a portion of the control means; Fig. 6 is an end elevation of one of the strike-off members; Fig. 6 is an end elevation of the other strike-off member; Fig. 7 is a sectional view drawn on a larger scale showing the means for cushioning the ramming mechanism at either extreme of movement; Fig. 8 is an enlarged view of a detail of the invention;

Specification. of Letters Patent.

Application filed November 26, 1913.

Patented Apr. 21, 1914.

Serial No. 803,116.

and Fig. 9 is a side elevation of the supporting track for one of the strike-01f memers.

Referring now particularly to Figs. 1, 2, and 3 it will be seen that our apparatus comprises in general a frame 3 on which are supported the stationary tracks B upon which the ramming roll 5 and its operating mechanism A are adapted to rest when in noperative position. Adjacent the frame 3 1s located a pattern drawing apparatus the framework of which we have designated by the numeral 6, the specific form of pattern drawing mechanism not being shown as having no relation to the present invention. Hinged to the framework 6, on opposite sides thereof, by means of hinges on brackets 7 is a pair of movable tracks C which are adapted to be swung to one side of the framework 6 when in inoperative position, and which are adapted to rest upon the top surface of a flask 9 when the latter is placed in position on the pattern drawing apparatus. lVhen the tracks C are swung to one side of the framework 6 they are clear of the flask and the latter can be freely re moved and another substituted. The brackets 7 appear in side and end elevation in Figs. 2 and 4 respectively.

The stationary tracks B and the movable tracks G are built up structures of the same form and comprise a main angle 10 and two smaller angles 11 and 12 which are riveted to the horizontal leg of the angle 10 in such manner as to provide in effect a channel section of the same length as the angle 10. A plurality of pins 13 are riveted through the small angles 11 and 12, thereby serving to form a rack. It will be understood that each of the stationary tracks B is provided with the smaller angle sections constituting the rack as well as are the tracks C and that when the tracks G are swung upwardly to operative position they aline with the stationary tracks B. The ramming roll 5 is gutteredor grooved at the ends and rides upon the horizontal legs of the large angles 10, the gutters or grooves being so arranged that the ends or flanges of the roll lie between the vertical legs of the angles 10 and the smaller angles 12 (see Fig. l and Fig. at). The legs thus extending into the grooves of the roll serve to guide the roll and also act as a sand retaining frame preventing lateral spreading of the sand in the flask. It will be apparent that the tracks C to gether with the racks they carry are of considerable weight and in order to make their manipulation easy we provide an arm or handle 14 at the forward end of each of the tracks and a pair of tension springs 15 each of which is fastened at one end to a bracket 16 secured to the framework 6 and at the other end to an arm 17 secured to the tracks C. The springs 15 counterbalance the tracks C so that they can be more easily movedinto and out of operative position. W hen the tracks C are swung into operative position they serve as sand retaining members adapted to retain the sand in position above the flask, and when they are swung to inoperative position to the side of the flask and frame 6 any sand that may have accumulated on the tracks will fall off, clearing the racks.

Attention is now directed to the mechanism for driving the roll. Mounted directly to the rear of the roll is a carriage or truck 18 which carries the operating mechanism and to which the roll is connected by means of the links 19 which are journaled on the axle of the roll and connected to the carriage by means of the bearings 20 and pins 21. The bearings 20 have a clearance at the top and bottom in the links 19 and the pins 21 are longer than the bearings 20 so a slight end play for the bearings is provided. The bearings 20 are held central in the arms 19 by pins 19 which are mounted in the arms in line with the long aXis of the arms and which also engage the bearings. The arms 19 can thus turn about the pins 21 and also about the bearings on any axis perpendicular to that of the pins. This construction is of importance as will hereinafter appear. The carriage 18 runs on four wheels 22 which in turn rest on the small angles 11 and 12 of the tracks and mounted upon the carriage is a motor 23 which is connected through the internal gear reducer 2 1 to a large spur gear 25 which meshes with a gear 26, keyed to the shaft 27 to which are keyed apair of sprocket wheels 28 which engage the racks of the tracks. From the foregoing it will be apparent that when the motor is turned in one direction the roll will move along the stationary tracks B onto the movable tracks 0 and when turned in the other direction will move backward along the tracks G onto the stationary tracks 13. It will thus be seen that the tracks B serve not only as a means to support the roll and carend play for the bearing blocks 20 is that the roll 5 can be tilted length-wise without damaging the hearing, such tilting being liable to occur when there is more sand on one side of the flask than on the other as, for example, when the operator neglects to fill one side of the flask.

The means for controlling the motor comprise the controller 29 which is mounted in the framework 3 and which has mounted on its shaft a gear 30 which meshes with a rack bar 31, one end of which is connected to a hand lever 32 pivotally carried on the side of the frame 3. hen the lever is moved the rack is advanced or retracted, as the case may be, and the shaft of the controller turned to make the desired electrical connections. The rack bar 31 extends to the for ward end of the pattern drawing mechanism being suitably supported by a plurality of bearings 33. In order to automatically stop the roll at either end of its travel, the rack bar 31 is provided at each end with a stop 34: which acts against springs Projecting down from one side of the carriage 18 in position to engage the stops is a bar 36. When the carriage is moved forwardly the limit of its travel the bar 36 strikes against the stop 34 which, through the medium of the spring 35 moves the bar or shaft 31 forwardly which effects the turning of the controller shaft and reverses the motor and brings back the truck and roll to rear position at which time the bar 36 strikes against the rear stop 34: and again shifts the rack bar 31 to stop the motor. The springs 35 used in connection with the stop mechanism are designed to prevent damage to the parts in case the roll does not stop promptly. The controller is so arranged that when the lever 32 is shifted to cause the roll to advance it reverses the motor when the bar 36 comes into engagement with the forward stop, and stops the motor when the bar 36 comes into engagement with the rear stop. It will be clear, however, that the lever 32 provides a. means whereby the motor can be manually controlled at will.

To assist the stopping and starting of the roll we provide a pair of bumpers 37 which are arranged at the rear of the frame 3 on opposite sides thereof and which are adapted to take against follower plates 38 which in turn take against springs 39 inclosed in cages 10 carried on the truck 18. It will be seen that when the carriage or truck is moved to rear position the plates 38 will take against the bumpers 3'7 and the carriage will be yieldingly stopped by the springs 39, the cages being cut away as at 4-1, so that they can slide past the bumpers 37. This movement places the springs 39 under compression and when the controller is actuated to start the motor forwardly, the springs tend to give the carriage an initial impulse forwardly. The cages 40 are provided at the forward ends with the follower plates 42 corresponding to the plates 38 and cables 43 passing through the follower plates and bumpers and over the sheaves 44 mounted on the bumpers. The cables are provided at their forward ends with chocks 45 and at their rearward ends with ehocks 46 and weights 47 the weights being designed to take up the slack. On the forward movement of the carriage the chocks 45 being held in engagement with the follower plates 42 by reason of the weights 47 the cables 43 are drawn forwardly until the chocks 46 abut against the rear faces of the bumpers 37. When this occurs the follower plates 42 are stopped and the springs 39 yieldingly stop the forward movement of the truck and the roll remaining under com pression so as to assist the motor as it reverses the movement of the apparatus. This apparatus is simple and a single pair of springs serves to stop the roll at either extreme of movement.

Attention is now directed to our improved and novel form of strike-off means whereby the level and configuration of the sand in the flask is regulated. For the purpose of illustrating this strike-01f means we have shown our invention applied to a machine designed to manufacture soil pipe and the flask shown is adapted to make eight soil pipes as indicated in dotted lines in Fig. 1. We provide two strike-offs, D and E, each of which comprises a plate 48 which extends across the machine in front of the roll, and the end plates 49 which are secured to the plat-es 4S atone end and have a pivotal mounting at their rear ends. The plates 49 of the strike-off E are pivoted as at 50 to the links 19 and the plates 49 of the strike-off D are pivoted as at 51 to the plates 49 of the strikeoff E. Both strike-oil's are free to rock independently of each other. The strike-off means proper are plates 52 and 53 which may be secured to the plates 48 in any desired manner. As arranged the strikeoff D, the forward strike-oft, is provided with wheels 54 which ride on the vertical leg of the angles 11 of the tracks and the strike-01f E with wheels 55 which are adapted to ride upon longitudinal bars 56 which extend along the tracks between the vertical legs of the large angles 10 and the small angles 12, the bars being riveted to the angles 12 through separating blocks or spacers 57. The construction is clearly shown in Fig. 4. The plate 52 of the strike-off 1) preferably has a straight edge and is slightly above the level of the plate 53 of the strike-off E. The plate 53 of the strikeofi' E is of an irregular shape being provided at its lower edge with rounded portions or projections 58 which make the general profile of the strike-off inverse to the general contour of the soil pipe patterns in the flask, and are adapted to leave smaller quantities of sand over the higher portions of the patterns and larger quantities over the lower portions. The plate 52 strikes olf the sand in the flask to the general level de sired and the plate 53, following after, gives the configuration to the sand which is best adapted to secure uniformity of ramming that is to say which secures a most uniform degree of hardness of the sand throughout the flask. It will be seen that the soil pipes adjacent their ends have portions of larger diameter than the main body of the soil pipe and that therefore it will be desirable to leave a smaller quantity of sand above such portions. The core prints of the pattern should be rammed hard and it is therefore, desirable to leave a greater depth of sand over the prints. T o accomplish the foregoing it will be observed that the bars 56 have hump portions 59 which are above the core prints and with depressed portions 60 located above the flange portions of the soil pipe. It will be clear that as the wheels 55 of the strike-off E ride over the hump portions and depressed portions that the sand left will be deeper and more shallow respectively at such points. By this arrangement the level and contour of the sand left above the patterns can be changed in any desired manner as it will be clear that either of the strikeofl's or both of them may be raised and lowered at various points, and this with changes in the lines of the strike oif plates proper will give any desired configuration necessary to secure the best results in ramming. In order to pack the sand at the ends of the box or flask so that the mold will not drop we provide pairs of pads 62 and 63 which are arranged on the tracks at the rear and forward ends respectively of the flask. As the roll is ad vanced it rides up onto the pads 62 and drops down onto the sand from off the forward ends thereof. said ends being preferably inclined. The sand is. of course, rammed very hard by the roll. The same action occurs on the reverse movement of the roll when it starts back from extreme forward position and rides down from oil the pads 63. Secured to the bottoms of the tracks C adjacent the rear ends thereof are blocks 64 which are provided with pins 65 adapted to pass through blocks 66 supported in any desired manner from the framework 3. The blocks 64 are adapted to rest upon the blocks 66 and support the tracks C as the roll rides from off the tracks B onto the tracks C and the pins 65 relieve the tracks C and the hinges or brackets 7 of end-wise thrust incident to the engagement of the rack by the sprocket wheels 28 as the roll is driven back and forth over the tracks C.

It Will be clear from the foregoing that the mechanism for driving the roll is, in effect, self contained and is very compact and takes up no extra head room. This is very advantageous in foundries having small floor space in which the usual form of apparatus, to wit, the long rack bar secured to the roll and extending out past the machine, is used. Other advantages incident to the apparatus will occur to those familiar with the art.

Whatwe claim is:

1. A roll ramming apparatus comprising in combination a flask, a roll adapted to ram the sand in the flask, a movable rack supported adjacent the flask and adapted to support the roll over the flask when in operative position, a gear engaging the rack and adapted to move the roll, and a motor for turning the gear, the said rack lying to one side of the flask when moved to inoperative position.

2. A roll ramming apparatus comprising in combination a roll, aflask, a track adapted to support the roll over the flask when in operative position, means for movably supporting the track, and means relieving the said means of the thrust of the roll endwise of the track as the roll is being moved.

3. A roll ramming apparatus comprising in combination a roll, a relatively stationary platform or roll support, a flask, a. movable roll support adjacent the stationary support adapted to support the roll over the flask and alining with the stationary support, and interengaging means on the supports adapted to relieve the movable support of endwise thrust as the roll is being moved.

l. A roll ramming apparatus comprising in combination a flask, a roll adapted to ram the sand in the flask, av motor coupled to move-with the roll, a rack, a gear engaging the rack and connected with the motor to move the roll, means for movably supporting the rack, and means relieving said first means of the endwise thrust of the roll as the latter is moved.

5. A roll ramming apparatus comprising in combination a roll, a relatively stationary platform or roll support, a flask adjacent thereto, a rack adapted to support the roll over the flask, means for movably supporting the rack, interengaging means on the rack and roll support relieving the rack supporting means of the thrust of the roll the latter is moved, and a gear engaging the rack and adapted to move the roll.

6. A roll ramming apparatus comprising in combination a roll, a relatively stationary track, a flask adjacent thereto, and a relatively movable track having a hinged mounting and adapted to support the roll over the flask and aline with the stationary track when in operative position and to lie at one side of the flask when in inoperative position, one of said tracks being provided with a pin and the other with a recess to receive the pin when the movable track is swung to operative position, said pin being adapted to take the end thrust of the roll on the movable track as the roll is moved.

7. A roll ramming apparatus comprising in combination a roll, a relatively stationary pair of racks for supporting the latter when in inoperative position, a flask, a pair of movable racks alining with the stationary racks, a pair of gears adapted to engage the racks for moving the roll, and a motor for turning the gears, the said mov able racks being adapted when in inoperative position to lie clear of the flask.

8. A roll "amming apparatus cmn nrising in combination a roll, a relatively stationary pair of racks for supporting the latter when in inoperative position, a flask, a pair of movable racks alining with the stationary racks having a hinged support, a pair of gears adapted to en age the racks for moving the roll, and a motor for turning the gears, the said movable racks when swung to inoperative position being adapted to lie to one side of the flask.

9. A roll ramming apparatus comprising in combination a roll, a pair of tracks adapted to support the roll over a flask and provided with a rack portion, and means for moving the roll comprising a truck to which the roll is connected and which is mounted on the tracks, a motor on the truck, and a gear adapted to be turned by the motor and engaging the rack portion, the connection between the roll and truck being a loose one to provide relative play as the roll rides on the sand.

10. roll ramming apparatus comprising in combination a roll, a. track adapted to support the roll. over the flask, and means above the normal level of the track adapted to let the roll down onto the sand with a jolt.

11. A roll ramming apparatus comprising in combination a roll, a track adapted to support the roll over the flask, and means whereby the rollv is let down onto the sand in the flask with a jolt.

12. A roll ramming apparatus comprising in combination a roll, a pair of tracks adapted to support the roll over a flask, and means adjacent an end of the tracks adapted to support the roll above the normal level of the tracks and let the roll down with a jolt as it rides onto the sand in the flask.

13. A roll ramming apparatus comprising in combination a roll, a pair of tracks adapted to support the roll over a flask, and pads adjacent an end of the tracks adapted to support the roll above the normal level of the tracks and let the roll down with a jolt as it rides onto the sand in the flask.

14. In roll ramming apparatus, a strikeoii mechanism comprising a plurality of strike-oil? members mounted in advance of the roll and for change in vertical position relative to each other.

15. In roll ramming apparatus, a strikeoh: mechanism comprising a plurality of strike-oil members arranged in advance of the roll and one in advance of the other and having relative movement with respect to each other.

16. In a roll ramming apparatus, a strikeoii mechanism comprising a plurality of strike off members mounted in advance of the roll and for movement relative to one another, and means for automatically moving one of the members.

17 In roll ramming apparatus, a strikeoff mechanism comprising a pair of strikeofl members each of Which is mounted for substantially vertical movement with re spect to the other, and means for automatically elevating one member with respect to the other.

18. In roll ramming apparatus, a strike off mechanism comprising a pair of strikeofl? members each of Which is mounted for substantially vertical movement with respect to the other and both arranged on one side of the roll.

19. In roll ramming apparatus, a strikeoit mechanism for treating the sand to be rammed comprising a plurality of strikeoff members independently movable relatively to each other and means for automatically shifting the position of one of said members with respect to the other.

20. In roll ramming apparatus, a strikeoif mechanism for treating the sand to be rammed comprising a plurality of strikeotf members independently movable relatively to each other, a support for each memher, and means on one 01": the supports for shifting the vertical position of the members supported thereby.

21. A roll ramming apparatus comprising in combination a roll, a pair of strike-01f members in advance of the roll having relative vertical movement, a track for supporting the roll, and supporting members for the strike-oft members.

22. A roll ramming apparatus comprising in combination, a flask, a roll adapted to ram the sand in the flask, a movable rack supported adjacent to the flask and adapted to support the roll over the flask in operative position, a gear engaging the rack and adapted to move the roll, and a motor for turning the gear, the said rack lying clear of the flask when moved to inoperative position, and serving also as a sand-frame to retain the sand above the flask While it is being rammed when in operative position.

28. A roll ramming apparatus comprising in combination a flask, a roll adapted to ram the sand, a motor coupled to move with the roll, a rack, and a gear engaging the rack and connected with the motor to move the roll, the roll having movement relative to the motor.

24. A roll ramming apparatus comprising in combination a flask, a roll adapted to ram the sand in the flask, a truck provided With a motor and connected to the roll, a support or track, and a member engaging the support and connected with the motor for moving the roll, the roll having movements relative to the truck.

In testimony whereof we have hereunto signed our names in the presence of the two subscribing witnesses.

HARRY P. MACDONALD. H. C. PARKER.

Witnesses:

J. F. ARNOLD, C. C. GREENLEE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

